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UNITED STATES DEPARTMENT OF AGRICULTURE 

 BULLETIN No. 556 



Contribution from the Forest Service 

 "rlENRY S. GRAVES, Forester 



Washington, D. C. 



PROFESSIONAL PAPER 



September 15, 1917 



MECHANICAL PROPERTIES OF WOODS 

 GROWN IN THE UNITED STATES 



By 



J. A. NEWLIN, in Charge of Timber Tests 



and THOMAS R. C. WILSON, Engineer in 



Forest Products 



CONTENTS 



Page 

 1 

 3 



Purpose of the Study 



Scope and Method of Experiments 

 Precautions to be Observed in the Use of 



the Data 4 



Data on Green Timber . 7 



Data on Air-dry Timber 7 



Explanation of Tables 1 and 2 . . . . 7 

 Explanation of Table 3 18 



Glossary 20 



Formulae Used in Computing 24 



Table 1 26 



Table 2 37 



list of Publications and Papers Dealing 

 with the Mechanical Properties of 



Timber 46 



WASHINGTON 

 GOVERNMENT PRINTING OFFICE 



1917 



